Ответ:
(z-6)(z+5)-(z-2)z=30
z²+5z-6z-30-(z²-2z)=30
z²+5z-6z-30-z²+2z=30
z-30=30
z=30+30
z=60
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Ответ:
(z-6)(z+5)-(z-2)z=30
z²+5z-6z-30-(z²-2z)=30
z²+5z-6z-30-z²+2z=30
z-30=30
z=30+30
z=60